DISCUSSION ON DEVELOPMENT MODELS OF THE SHEARING FRACTURES IN FAULT BEND FOLDS

ZU Ke-wei; ZENG Lian-bo; ZHAO Xiang-yuan; LIU Guo-ping

Volume 20 Issue 1

Mar. 2014

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ZU Ke-wei, ZENG Lian-bo, ZHAO Xiang-yuan, et al., 2014. DISCUSSION ON DEVELOPMENT MODELS OF THE SHEARING FRACTURES IN FAULT BEND FOLDS. Journal of Geomechanics, 20 (1): 16-24.

Citation:

ZU Ke-wei, ZENG Lian-bo, ZHAO Xiang-yuan, et al., 2014. DISCUSSION ON DEVELOPMENT MODELS OF THE SHEARING FRACTURES IN FAULT BEND FOLDS. Journal of Geomechanics, 20 (1): 16-24.

Citation:

ZU Ke-wei, ZENG Lian-bo, ZHAO Xiang-yuan, et al., 2014. DISCUSSION ON DEVELOPMENT MODELS OF THE SHEARING FRACTURES IN FAULT BEND FOLDS. Journal of Geomechanics, 20 (1): 16-24.

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DISCUSSION ON DEVELOPMENT MODELS OF THE SHEARING FRACTURES IN FAULT BEND FOLDS

1.
College of Geosciences, China University of Petroleum, Beijing 102249, China
2.
State Key Laboratory of Petroleum Resource and Prospecting in China University of Petroleum, Beijing 102249, China

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Received: 2013-10-23
Published: 2014-03-01

Abstract

Abstract

This paper focuses on a typical section of fault-bend fold in Kuqa foreland basin, by use of the shear fractures data measured in different structural position of the outcrop, and the fractures development laws are analyzed and then development models of the shearing fractures in fault-bend fold in Kuqa foreland basin are established. Statistical result shows that the shear fractures in the outcrop can be divided into two types: shear fractures at a high angle to layers extensively develops in each position in the outcrop, and bed-parallel fractures presenting near the fault, mainly develops near the fault with attitudes changing with the deformation of the layers. The intensity of shear fractures development decreases with the distance away from the fault as a whole. The gradient of shear fractures development in the footwall has a greater descending rate than that in the hanging wall. The density of shear fractures in the hanging wall is greater than that in the footwall. The density of shear fractures in the hinge of the fold is less than that in the forelimb and backlimb, besides higher density appears in the internal surface with respect to that in the external surface. The change of the dip angle in the fault bendfold causing the alteration of the movement for the hanging wall makes the stresses concentrating on the axial faces. So the phenomenon of the increase of intensity of shear fractures near this position can be appeared. The development model of shear fractures in the fault-bend fold shall be separated into 3 stages: regional fractures are mainly developed before the generation of fault; after the formation of the fault with dragging deformations near not obvious, new shear fractures will be formed in the position where the axial surface pinned at the lower ramp inflection point passes through, one at a high angle to the layer and the other at a low angle to the fault; the bed-parallel fractures will be presented in the curved sections and the intensity of fractures development near fold hinge is higher than that in two limbs, when the dragging deformations are obvious. The study on the model of shearing fractures development has a guiding significance for exploring the law of fractures development and prospecting the fractured reservoir in the foreland basin, especially in the deep layers with complex tectonic style.
- fault-bend fold,
- shear fractures,
- distribution law,
- development model

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References(31)

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